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Research and Realization on Watermarking Algorithms for Digital Copyright Protection and Authentication

Author: XingJuanJuan
Tutor: ZhouZuDe
School: Wuhan University of Technology
Course: Communication and Information System
Keywords: Copyright Protection Copyright authentication Digital watermarking DSP implementation
CLC: TP309.7
Type: Master's thesis
Year: 2010
Downloads: 76
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Abstract


With the rapid development of network communication technology, network multimedia distribution, copying and editing has become increasingly common, media providers also increasingly strong demand protection of their digital content, copyright issues have received increasing attention. Digital watermarking copyright protection and authentication as the implementation of effective means of multimedia information security has become a hot topic. But as a technical system, the digital watermark is not perfect. Meanwhile, the current study are most watermarking algorithm implemented on the PC. With the amount of digital watermarking algorithm is increasing, complexity continues to increase, the urgent need for a high-speed computing to execute large computing tasks. DSP is undoubtedly an effective means. Watermarking algorithm for copyright protection, usually require good stability and robustness. This paper presents a spread spectrum technique based on chaos and airspace watermarking algorithm, the watermark sequences generated through chaotic mapping, and then the watermark is embedded into the sub-hopping image. Experimental results show that the algorithm filtering, noise and shearing attack has strong robustness. Also proposed an approach based on integer lifting wavelet transform digital watermarking algorithm, first the original image block lifting wavelet transform, and then direct sequence spread spectrum sequences generated watermark embedded into a fixed-frequency sub-band. The algorithm can resist common image processing attacks, and has good invisibility. Watermarking algorithm for copyright authentication usually requires the ability to resist some common image transformation, and has a vulnerability to malicious attacks. This paper presents a chaotic scrambling and digital watermarking algorithm using the average value of the original gray image watermark generated chaotic mapping, and then scrambled watermark embedded in the image. Meanwhile, the proposed based on singular value decomposition fragile watermarking algorithm, the original image block singular value decomposition, and then singular values ??related sequences and chaotic sequences XOR after embedding the original image. Both algorithms are based on the original image content fragile watermarking. This paper also studied digital watermarking algorithm DSP system implementation to integer lifting wavelet transform based watermarking algorithm, for example, detailed description of the implementation process as well as during the entire needs attention.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality > Encryption and decryption
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